Nick Kyrgios views Roger Federer as the "ultimate role model" to anyone who harbours ambitions of playing tennis and admits he should "take a leaf out of his book", while he admitted he's open to the possibility of adding a mentor figure to his team going forwards.
Federer himself marked the shot as one of the most memorable.
Chasing down a cheeky drop shot, the five-times Flushing Meadows champion scooped the ball inches off the ground and curled it around the net post for a ridiculous victor that earned him a standing ovation from the hollering crowd. Isner defeated No. 25 Milos Raonic of Canada 3-6, 6-3, 6-4, 3-6, 6-2 and now faces 2009 champion Juan Martin del Potro who pounded 18 forehand winners in a 6-4, 6-3, 6-1 victory over No. 20 Borna Coric and hasn't dropped a set through four matches.
But Federer escaped, breaking Kyrgios to pocket the first set and dominating the second.
Federer will fight for a quarter-final berth against another Australian, John Millman, who reached his first Grand Slam fourth round with a 6-4, 4-6, 6-1, 6-3 victory over Mikhail Kukushkin of Kazakhstan.
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With Kyrgios serving at 5-5, Federer asked the question again, and Kyrgios could only reply with two unforced errors to hand his opponent the break.
Alexander Zverev of Germany reacts after winning a game against Philipp Kohlschreiber of Germany (not pictured) in the third round on day six of the US Open at USTA Billie Jean King National Tennis Center.
The Swiss ace withstood the early surge of Australia's Nick Kyrgios, battling past him in the opening set, wrapping up proceedings in three sets within one hour and 44 minutes on Saturday.
The Aussie star took to social media to congratulate the 37-year-old and predicted Federer could well be on his way to the 21st Grand Slam of his career.
"Today I think he didn't come up with the goods when he really had to, and I was good, I think, by making him hit that extra shot". "It was nearly unreal. Other big shots I remember, with Andy (Roddick), the counter-smash, and of course the between-the-legs here with Novak (Djokovic)", he said of the shot.
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"Almost got to the point where I wanted him to start making shots like that, and I finally got it".
Once again involved in controversy, after his second round showing that required a much-debated pep talk from umpire Mohamed Layhani, Kyrgios promised he would compete all the way against the five-time US Open champion.
But he said no matter what he tried, Federer had the answers.
"So clearly when you play that way and you lose, it's always, like, you feel like he's so much to blame, but that's just how he plays". "Yeah, definitely the around-the-pole shot was unique, it can only happen in a bigger court where you play with the singles net".
"He was too good", Kyrgios said. "I don't think I have done anything". "He loosened up straightaway after that".
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"If I can be any sort of inspiration for guys coming up on the tour, that would be great, you know, in whatever shape and form that is".